56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
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package metrics
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import (
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"log"
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"net/http"
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"time"
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"github.com/gorilla/mux"
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"github.com/pkg/errors"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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bolt "go.etcd.io/bbolt"
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"gitea.hashru.nl/dsprenkels/rushlink/internal/db"
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)
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const (
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METRICS_ADDR = "127.0.0.1:58614"
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)
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func StartMetricsServer() {
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var (
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_ = promauto.NewGaugeFunc(prometheus.GaugeOpts{
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Namespace: "rushlink",
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Subsystem: "shorten",
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Name: "urls_total",
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Help: "The current amount of shortened urls in the database.",
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}, func() float64 {
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var metric float64
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if err := db.DB.View(func(tx *bolt.Tx) error {
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bucket := tx.Bucket([]byte("shorten"))
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if bucket == nil {
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return errors.New("bucket 'shorten' could not be found")
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}
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metric = float64(bucket.Stats().KeyN)
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return nil
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}); err != nil {
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log.Printf("error: %v", errors.Wrap(err, "fetching shorten_urls_total metric"))
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return 0
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}
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return metric
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})
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)
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router := mux.NewRouter()
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router.Handle("/metrics", promhttp.Handler()).Methods("GET")
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srv := &http.Server{
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Handler: router,
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Addr: METRICS_ADDR,
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WriteTimeout: 15 * time.Second,
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ReadTimeout: 15 * time.Second,
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}
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log.Fatal(srv.ListenAndServe())
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}
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